Mexicali Fresh is offering a free Burrito or other menu item on your birthday month (value of $14.90) when you are part of their free Cabana Club. You also get the following by being part of the club:
$1 credit for every $10 spent
Buy 10 Burritos get the 11th one Free
Member news and specials
Free Burrito or other menu item on your birthday month (value of $14.90)
Previously they offered a free taco on joining and only a burrito on the birthday. So a bit better, a bit worse.
Check out other birthday deals on the wiki.